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Stability Analysis of a Cracked Rotor With Several Degrees of Freedom

[+] Author Affiliations
Roberto Ricci, Paolo Pennacchi

Politecnico di Milano, Milan, Italy

Paper No. DETC2009-86764, pp. 1079-1087; 9 pages
  • ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 1: 22nd Biennial Conference on Mechanical Vibration and Noise, Parts A and B
  • San Diego, California, USA, August 30–September 2, 2009
  • Conference Sponsors: Design Engineering Division and Computers in Engineering Division
  • ISBN: 978-0-7918-4898-2 | eISBN: 978-0-7918-3856-3
  • Copyright © 2009 by ASME


It is a common notion in literature that cracks in horizontal rotating shafts can cause instability of the system. Actually the stiffness variation due to the breathing mechanism may cause parametric excitation to the rotor system. This phenomenon has been investigated by means of both analytical models and simulation, but the studies are related to simple Jeffcott’s rotors. In this paper the method normally used to investigate the stability of cracked rotors, i.e. Floquet’s theory, is applied for the first time to a model of a real rotor with several degrees of freedom, considering also the bearings and the foundation. Huge calculation resources have been necessary and this may explain why this analysis was not performed before. The results are very different from those obtained by means of simple Jeffcott’s rotor.

Copyright © 2009 by ASME



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